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Symbionts As Major Modulators of Insect Health: Lactic Acid Bacteria and Honeybees

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Symbionts As Major Modulators of Insect Health: Lactic Acid Bacteria and Honeybees Symbionts as Major Modulators of Insect Health: Lactic Acid Bacteria and Honeybees Alejandra Va´squez1*., Eva Forsgren2, Ingemar Fries2, Robert J. Paxton3,4, Emilie Flaberg5, Laszlo Szekely5, Tobias C. Olofsson1*. 1 Department of Laboratory Medicine, Medical Microbiology, Lund University, Lund, Sweden, 2 Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden, 3 School of Biological Sciences, Queen’s University Belfast, Belfast, United Kingdom, 4 Institute for Biology, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany, 5 Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, Stockholm, Sweden Abstract Lactic acid bacteria (LAB) are well recognized beneficial host-associated members of the microbiota of humans and animals. Yet LAB-associations of invertebrates have been poorly characterized and their functions remain obscure. Here we show that honeybees possess an abundant, diverse and ancient LAB microbiota in their honey crop with beneficial effects for bee health, defending them against microbial threats. Our studies of LAB in all extant honeybee species plus related apid bees reveal one of the largest collections of novel species from the genera Lactobacillus and Bifidobacterium ever discovered within a single insect and suggest a long (.80 mya) history of association. Bee associated microbiotas highlight Lactobacillus kunkeei as the dominant LAB member. Those showing potent antimicrobial properties are acquired by callow honey bee workers from nestmates and maintained within the crop in biofilms, though beekeeping management practices can negatively impact this microbiota. Prophylactic practices that enhance LAB, or supplementary feeding of LAB, may serve in integrated approaches to sustainable pollinator service provision. We anticipate this microbiota will become central to studies on honeybee health, including colony collapse disorder, and act as an exemplar case of insect-microbe symbiosis. Citation: Va´squez A, Forsgren E, Fries I, Paxton RJ, Flaberg E, et al. (2012) Symbionts as Major Modulators of Insect Health: Lactic Acid Bacteria and Honeybees. PLoS ONE 7(3): e33188. doi:10.1371/journal.pone.0033188 Editor: Niyaz Ahmed, University of Hyderabad, India Received January 20, 2012; Accepted February 9, 2012; Published March 12, 2012 Copyright: ß 2012 Va´squez et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Funding: This work was funded by grants from the Gyllenstierna Krapperup’s Foundation, Ekhaga Foundation, the Swedish Board of Agriculture, The Swedish Research Council Formas, the EU FP7 project BeeDoc (244956), the Biotechnology and Biological Sciences Research Council’s Insect Pollinators Initiative (grant BB/ I000100/1), and the European Science Foundation COST (European Cooperation in Science and Technology) network COLOSS (FA0803).The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Competing Interests: The authors have declared that no competing interests exist. * E-mail: [email protected] (AV); [email protected] (TO) . These authors contributed equally to this work. Introduction bacterial group for the food industry and the fermentation of dairy products. In addition, strains within LAB are also generally Symbiosis is common in nature, in which symbionts as recognized as safe (GRAS) food grade microorganisms and commensals or mutualists evolved to benefit each other. Culture- employed as probiotics bestowing human health [10,11]. Genera independent studies of the human microbiota identified recently a within LAB are functionally related by phenotypic characteristics complex symbiotic environment with more than 1,000 bacterial [12] and considered as beneficial organisms commonly found as phylotypes representing more than 7,000 strains [1]. The both exogenous and endogenous microbes in healthy individuals. composition of this microbiota has been suggested to be a result LAB found within humans and animals as commensals are known of a highly coevolved symbiosis and commensalism influenced by to protect their hosts via antimicrobial metabolites and modulation nutrition, physiology and immunological factors [2,3]. of host immune response [13,14]. One of the most important The insect gut has been described as the greatest unexplored genus within LAB is Lactobacillus, which is continuously under reservoir of microbiological diversity [4]. Ryu and colleagues [5] taxonomic discussion and includes at present 175 listed species established the importance of the normal flora in the fruit fly gut in [15]. order to sustain health. This small microbiota was sufficient to We have discovered a rather special symbiotic lactic acid suppress growth of pathogens. While insects harbour a smaller bacterial (LAB) microbiota within the honey crop of the Western number of symbionts compared to humans they may be even honeybee Apis mellifera [16]. The crop is a central organ in the more important [6]. Studies have shown that symbiosis between honeybee’s food production between the oesophagus and social insects and microbial species are often highly coevolved [7] ventriculus, used for collection and transport of nectar to hive. and that these symbionts are evolutionary shaped distinctly from The crop microbiota of A. mellifera is composed of 13 bacterial the forces acting upon symbionts of solitary organisms, which species within the genera Lactobacillus and Bifidobacterium [16,17,18] normally lack a homeostatic fortress environment [8]. and it plays a key role in the production of honey [16] and bee- Lactic acid bacteria (LAB) are found as commensals within bread [19], long term stored food for both adult honeybees and humans, insects and animals [9]. They confer an important larvae. Our recent studies on the subspecies of A. mellifera have also PLoS ONE | www.plosone.org 1 March 2012 | Volume 7 | Issue 3 | e33188 Symbiosis between LAB and Honeybees demonstrated that the LAB microbiota is consistent across its and fluorescence microscopy that the microbiota form biofilms native and introduced range [17]. and networks (Figure 2 and Figure 3; Video S1 and Video S2) by Metagenomics has been used to identify a rich diversity of which they attach to the wall of the crop using structures microbes within honeybees afflicted by Colony Collapse Disorder resembling extracellular polymeric substances (EPS) (Figure 2). (CCD) [20], including emergent pathogens (i.e. Nosema ceranae and viruses) [21], while recent studies have picked up novel bacterial Functional characterization genera within the intestinal tract of bees by culture independent The microbial composition of 15 flowers frequently visited by A. methods [20,22,23]. Some of these may comprise important mellifera in Sweden was investigated (Table S1). In total sixty symbionts for the maintenance of bee health; however, these transient microorganisms were isolated from flowers and identified descriptive methods do not inform on the functional role or to the species level (Accession nr: JN167926-JN167985). We tested importance of the bee crop microbiota or of individual symbionts the inhibition properties of all honey crop LAB grown individually within this niche. and together against the 55 bacterial strains and 5 yeast strains We have demonstrated by both in vitro and in vivo studies that the isolated from flowers. There was a clear overall inhibition of all LAB microbiota in A. mellifera inhibit one important honeybee transient flower microorganisms by single members of the LAB pathogen, the bacterial brood pathogen Paenibacillus larvae that is microbiota in the honey crop (Table S1). L. kunkeei, the most the cause of the brood disease American foulbrood (AFB) [24]. In common species in all bees (Figure 1), was also the most potent, the current study we investigate if the LAB microbiota is consistent inhibiting all tested microorganisms. in all nine recognized honeybee (Apini) species plus stingless bee The LAB microbiota partly inhibited the bee pathogen M. species (Meliponini), a phylogenetically close taxon that, like plutonius in vivo (Figure 4) and totally in vitro, L. kunkeei and the honeybees, are eusocial, live in colonies comprising one queen and thirteen LAB together showed the best inhibition properties. The 100’s to 10,000’s of workers, store large quantities of honey and overall effect of adding the LAB mixture to bee larval food was a bee bread and are managed commercially or exploited by ethnic significant reduction in the number of dead larvae (Figure 4, 2 groups across the tropics. X 4 = 24.27, 2-tail P: ,0.001). The total mortality of the Functional characterization of the endogenous crop microbiota uninfected control groups (with or without LAB supplement) was is essential in providing insights for the understanding of its role for ,7% in both replicates. The results demonstrate that addition of bee health and disease. Here we explore the diversity, mainte- LAB to the food of young honeybee larvae exposed to M. plutonius nance and dynamics of LAB in the honey crop and the pivotal role decreases the number of larvae succumbing to EFB infection. that they play in bee health, with major implications for research on bee decline and sustainable pollinator management. LAB and antibiotics In vitro culturing of the 13
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